Lab Report Purpose: Osmosis and diffusion through potato core in different concentration (viable) : The concentration of solution in a solution will affect the movement of water across potato cell membrane Material: Potato core Sucrose solution (0.2‚0.4‚0.6‚0.8‚1.0) Electronic Balane Test tube and rack Scalpel Plastic Weighing tray Cork Borers Method: Day 1 use you cork borers to bore 6 vertical hole on your potato. remove the potato cylinders from
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1 Diffusion is the movement of molecules (or ions) from a high concentration to low concentration. Diffusion is form of passive transport as energy does not need to be generated. Diffusion is complete when the concentration of molecules is equal on either side of the membrane. Diffusion rate can be influenced by many factors such as: Concentration gradient across the the membrane. Permeability of the membrane to the diffusing substance. Temperature. Surface area of the membrane. Question 2 2.1
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the tubes contained different amount of sucrose concentrations. The higher molarity concentrations increased the movement of water to balance out the inside of the tube and the beaker. The greater amount of concentration gradient‚ in each tube‚ increased the rate of osmosis. This rate of osmosis is due to the net movement of water from an area of low concentration to an area of high concentration. Because the tubes had different concentrations‚ certain tubes gained more mass than others. Solution
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Daphnia heart rate Independent: caffeine concentration Dependent: heart rate of Daphnia Measuring the content of Vitamin C in fruit juice Independent: fruit juice Dependent: volume of juice required to decolourise 1cm3 of DCPIP The effect of temperature on cell membranes Independent: temperature of water Dependent: % transmission of light through resulting solution The effect of changing enzyme concentration on rate of reaction. Independent: concentration of enzyme dependent: time taken for enzyme
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then distilled‚ and diluted into 4 containers to obtain concentrations of 100%‚ 75%‚ 50% and 25%. There were 6 set-ups‚ each with 10 cockroaches‚ one positive control set-up‚ in which the group used commercial pesticide‚ one negative control set-up‚ containing water‚ and one each for the different concentrations of the extract. The experimental results provided evidence for a conclusion that the extract with the higher concentration killed more cockroaches. There is a significant difference
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droplet and the volume of NaOH needed to neutralise the benzoic acid in aqueous solution. From the volume collected for 50 droplets surface area and radius is calculated for a droplet. The uses of the surfaces area and volume help to determined the concentration of benzoic acid in kerosene‚ mole of benzoic acid transferred‚ molar flux and mass transfer coefficient. 2.0 Theoretical background The background of these studies is to estimate and understand the extraction of benzoic acid in
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calorimeter is used to measure the heat of solution of KNO3 in water. The generalized reaction for this solvation is: A + x S → A xS (solution at m concentration) Where: A is pure solute S is pure solvent which is mixed to form a solution m is the molal concentration. . The change in enthalpy accompanying this reaction depends upon the final solution concentration. Two measures of enthalpy have proved useful in determining the heat of solution: the integral heat of solution and the differential heat of
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Laboratory Exercise #2 Pre Lab This lab will teach me how to use a spectrophotometer. The use of the spectrophotometer is to measure the concentration of solute. The solute being measured must be colored and is determined based on the adsorption of light photons on a wavelength. The spectrophotometer uses a beam of light that strikes the diffraction grating that basically forms of prism of light. Then only a specific wavelength of light shines through the spectrophotometer and interacts with
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had the overall impact in this excitement a little on osmosis. Osmosis takes place when two solutions of different concentrations are separated by a semi-permeable membrane in which the solvent can pass through but not the solute. In our experiment‚ we used a sucrose solution that will be a hypotonic concentration of solute. This tells us that the solution has a lower concentration of water than does the cells. Therefore‚ due to osmosis‚ the cells will gain water weight also proven in the experiment
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Liangting Lin 1-4 Lab Partner: Sunny Zhao 20C: Acid-Base Titration Purpose/Objective: 1. To titrate a hydrochloric acid solution of unknown concentration with 0.50M sodium hydroxide‚ and determine the molarity of the hydrochloric acid 2. To titrate an acetic acid solution with 0.50M sodium hydroxide‚ and determine the molarity and percentage composition of the vinegar. Apparatus and Materials:
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